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It's been a week since my wife returned home to give birth. Eita, who had been enjoying living alone for the first time in a long time, came to help her with her housework, her sister-in-law, Kaho. Every time she cleans, Eita gets an erection when she is shown the brown body of Kaho with a dazzling sunburn. If nothing is done, we will make a mistake. Desperately trying to gather reason and maintain a normal mind, Kaho reaches out to his crotch as if laughing.